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Coking wastewater treatment progress

Abstract:

with the development of industry, the industry of coking wastewater treatment

problem is more and more attention. Especially in our country, China is now the world's

coke

production power. Coking wastewater treatment problem is especially important. The

excess

emissions of coking wastewater once, will be of great harm to the environment. The

following

will make an analysis about the present situation of the coking wastewater treatment, wastewater

treatment in coking technology of physical chemistry, biochemistry, and management technology

abroad.

Keywords: coking wastewater, physical and chemical method, deamination

technology,

biochemistry method

Now coking wastewater [1] treatment are mostly using common activated sludge

process, the waste water in the atmosphere, cyanide, etc have certain heat

removal

efficiency, and poor efficiency of COD and NH3-N place, even there is no way

to

destination. Production practice shows that the waste water toremove the

main

difficulties of coking wastewater is the removal of organic matter and NH3-N, due to

the ammonia nitrogen and organic matter such as polycyclic aromatic hydrocarbons

have toxicity and inhibitory effect on microorganism, is the defect of

coking

wastewater treatment technology and wastewater treatment cost is higher.

Now

mature processing method mainly coking wastewater with physical method, chemical

method, biological method and chemical method; Now, most of the coking plant

is

mainly comprehensivetreatment of coking wastewater biochemical method

and

physicochemical method.

1、Pretreatment of coking wastewater

Coking wastewater in the part nor easily biodegradable organic matter, need to

adopt the appropriate pretreatment technology. The pretreatment of the

commonly

used method is the anaerobic acidification method. This is a kind of

between

anaerobic anaerobic-aerobic process, its function mechanism is through

anaerobic

microbial hydrolysis and acidification of refractory organic matter chemical structure

changes, make easily degradable materials. Coking wastewater after anaerobic acidification pretreatment can improve the aerobic biodegradation of

refractory

organic matter performance, create favorable conditions for the subsequent

aerobic

biological treatment.

2、The secondary processing

The coking wastewater generally first pretreated by conventional

methodand

then biological dephenolizing secondary processing. However, coking

wastewater

after the treatment, cyanide, COD and ammonia nitrogen in wastewater

effluent

indexes are still hard to

amount to mark. Aiming at this situation, scholars at home

and abroad in recent years has carried out a lot of research work [2], developed many

coking wastewater treatment technology is more effective.

2.1 Physical and chemical treatment

Adsorption method Adsorption method is to adopt the method of adsorbent

to

remove pollutants. Activated carbon has a good adsorption performance and

stable

chemical properties, is one of the most commonly used adsorbent. The depth of the

activated carbon adsorption method is suitable for wastewater treatment.

However,

because of activated carbon regeneration system operation is difficult, device of the

high cost of running, not widely used in the coking wastewater treatment. Liu Junfeng

[3], such as using high temperature furnace slag filtration, reoccupy nankai

brand

H-103 macroporous resin adsorption process containing phenol 520 mg/L, COD 3200

mg/L coking wastewater, the treatment of phenol water content or less 0.5

mg/L,

COD acuities were 80 mg/L, meet the national discharge standard. Huang Niandong [4]

to study the cinder of coking wastewater purification effect. They filter speed onthe

particle size, pH, solution and the influence factors of various factors on

the

adsorption capacity for the inspection, the results showed that phenol 30 mg/L liquid,

the flow velocity 4.5 mL/min, pH 2-2.5, the temperature 25℃ condition, the removal

rate of phenol was 98%.

2.2 Biological chemical method

Biochemical method is the use of microbial oxidation, decomposition, adsorption

of organic pollutants in wastewater treatment, this method is the most widely used in

sewage treatment and an effective method. In recent years, people from microbes,

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英语科技论文写作作业

英语科技论文写作作业

《英语科技论文写作作业》

Unbending Roll Alignment and the Related Strain for

Billet/Bloom Casters

方坯连续拉矫辊列设计及其矫直应变分析

学院：

专业：

姓名：

学号:

原文：

Abstract The unbending design is one of key technologies for highly efficient

continuous casting. At present, the straightening processes have been developed from

solid core unbending to the one with liquid core. The latter includes single-point

straightening、multi-point straightening,VAI continuous straightening and CONCAST

continuous straightening. Based on the principle analysis of the continuous unbending,

A computerized code has been developed via Visual Basic according to the principal

of continuous unbending casting. The related unbending roll alignments have been

calculated and adopted in industry casters. The coordinates of the unbending roll 、the

strain and the low value of the strain rate of the solid/liquid interface during the

科技英语论文摘要的时态选择

科技英语论文摘要的时态选择

科技英语论文摘要的时态选择

摘要： 时态问题是中国学者在科技英语论文写作中很容易忽视的一个重要问题。时态的不恰当使用可能会导致文章意思的变化，使人产生误解，以致影响论文的发表。本文选取50篇中国理工科学者论文原稿的摘要，统计分析其时态选用情况，揭示当今学者的时态选用趋势。

关键词： 科技英语论文摘要时态选择趋势

一、引言

关于论文时态的讨论，国外早已有之。heslot在1982年调查了16篇论文中一般现在时和一般过去时在各章节中的使用频率，发现引言和结论部分，以及方法和结果部分时态使用惊人得相似。之后的著名学者swales（1990，2004）和day（1995，2006）也得出了同样的研究结论。同时，二者也描述了论文中时态的使用原则，成为学者们进行论文写作的时态指南。其中day提出对客观真理或已发表的成果使用一般现在时，而对作者当前的工作使用一般过去时。国外其他一些科技论文写作的辅导书也对时态的使用进行了描述，也有学者对时态错用现象进行了研究。在德国学者joy

burrough-boenisch（2003）的研究中，来自8个国家的45名科学家对3名德国生物学家习作的结论部分进行评价并做相应的注释。该研究发现母语为英语的作者和母语为非英语的作者都会在时态上犯错误，并总结了三个原因：母语为非英语的作者的英语水平；

母语干扰；其他语言报道过去发生事情的时态使用原则。hinkel（1997）通过对比亚洲学生与母语为英语的国家的学生在使用时态方面的差异， 认为亚洲语言与英语对“时间永恒”的理解上存在差异。近年来，国内也有一些学者对论文的时态进行了研究。腾真如（2004）抽样统计2001—2003年发表的中外100篇学术论文英文摘要，揭示中外作者在时态上的使用趋势。张帆（2001）就我国医学期刊英文摘要的时态问题进行了论述。之后张晓枚（2006）以nwoguo提出的论文十一步分别对各步时态的使用进行了探讨。此外，国内一些关于科技英语论文写作的书籍也对时态的选择进行了讲解。

英语科技论文写作

英语科技论文写作

English technology thesis writing

Name:

Studies: Steel metallurgy

Glass:

题目

：The experiment study of use Iron Tailings and Magnesite

Tailings Prepare Cordierite-based Glass Ceramics

Abstract ：This is work make some exploration about how to use iron

tailings and magnesite tailings making glass-ceramics feasibility and

preparation methods. Thus, turning waste into wealth and raising

added-value of iron ore tailings and magnesite talings . In this work, the

main raw material are iron ore tailings and magnesite tailings of Anshan

area . And, adding nucleation agent and some other oxide follow the

certain proportion , then production MgO - Al2O3 - SiO2 as the mainly

crystalling phase of microcrystalline glass. In the experimental, we use

DSC to measured nuclear and crystallizing temperature of glass-ceramics

英语科技论文写作 2

英语科技论文写作 2

英文科技论文写作是进行国际学术交流必需的技能。一般而言，发表在专业英语期刊上的科技论文在文章结构和文字表达上都有其特定的格式和规定，只有严格遵循国际标准和相应刊物的规定，才能提高所投稿件的录用率。

撰写英文科技论文的第一步就是推敲结构。最简单有效的方法即采用IMRaD形式(Introduction，Materials and Methods，Results，and Discussion)，这是英文科技论文最通用的一种结构方式。

IMRaD结构的逻辑体现在它能依次回答以下问题：

Introduction（引言）：研究的是什么问题？

Materials and Methods（材料和方法）：怎样研究这个问题？

Results（结果）：发现了什么?

Discussion（讨论）：这些发现意味着什么?

按照这个结构整体规划论文，有一个方法值得借鉴，即剑桥大学爱席比教授提出的“概念图”。首先在一张大纸上（A3或A4纸，横放）写下文章题目（事先定好题目很重要），然后根据IMRaD的结构确定基本的段落主题，把他们写在不同的方框内。你可以记录任何你脑海中闪现的可以包括在该部分的内容，诸如段落标题、图表、需要进一步阐述的观点等等，把它们写在方框附近的圈内，并用箭头标示它们的所属方框。画概念图的阶段也是自由思考的阶段，在此过程中不必拘泥于细节。哪些东西需要包括进文章？还需要做哪些工作，是找到某文献的原文，还是补画一张图表，或者需要再查找某个参考文献？当你发现自己需要再加进一个段落时就在概念图中添加一个新框。如果你发现原来的顺序需作调整，那就用箭头标示新的顺序。绘制概念图的过程看似儿童游戏，但其意义重大，它可以给你自由思考的空间，并通过图示的方式记录你思维发展的过程。这便是写论文的第一步：从整体考虑文章结构，思考各种组织文章的方法，准备好所需的资料，随时记录出现的新想法。采用这个方法，不论正式下笔时是从哪一部分写起，都能够能做到大局不乱。